You know what the Mojave desert was missing? My Little Pony, of course. My Little Pony buddies, to be precise. Here's a mod by Kuroitsune and Riven1978 on New Vegas Nexus that allows you to have the MLP protagonists as your companions. Not all ponies are included—for now, there's only Luna, Celestia, Twilight, Fluttershy, Applejack, Rarity, Rainbow Dash, Pinkie Pie, Ditzy/Derpy and a few others. Perhaps the best part about this is that the ponies come with specific perks.

Littlepip - Stable 2 - Whenever Littlepip is your Pony Companion, you will receive +10 points to Science, Medicine, and Repair and 1 point to Charisma, at a cost of 1 point of Agility and Strength, and -5 to Guns, Melee Weapons, and Unarmed Weapons.

Luna - Mare of the Moon - During the night as long as Luna is your Pony Companion, you will slowly regenerate health. Luna will also gain a 20% combat effectiveness.

Celestia - Mare of the Sun - During the day as long as Celestia is your Pony Companion, you will receive 30 points to Energy Weapons, at a cost of 10 to all of your other offensive skills. Celestia also gains a 20% damage potential.

BonBon - Friendship Is Magic - When Bon Bon's health gets below 30%, Lyra will appear to help out in the battle.

Lyra - Friendship Is Magic - When Lyra's health gets below 30%, Bon Bon will appear to help out in the battle.